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According to ISO 764 or its equivalent DIN 8309 (Deutsches Institut für Normung - German Institute for Standardization) a watch must resist exposure to a direct current magnetic field of 4800 A/m. The watch must keep its accuracy to ±30 seconds/day as measured before the test in order to be acknowledged as a magnetic-resistant watch.
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Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m 2]. [1] One tesla is equal to 10 4 gauss. Magnetic field drops off as the inverse cube of the distance ( 1 / distance 3 ) from a dipole source. Energy required to produce laboratory magnetic fields increases with the square of magnetic field. [2]
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America's snowiest cities are a mix of mountain towns and those near the world's largest group of freshwater lakes. What's considered average in these areas would be incomprehensible even for ...
Detail of PRR 4800 showing the builder's plate. In 1933, the Pennsylvania Railroad decided to replace the P5, and instructed General Electric and Westinghouse to design an electric locomotive that was more powerful than the P5, capable of speeds of 100 miles per hour (161 km/h), have a lighter axle load and to be double-ended with a cab in the center of the carbody. [3]
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